Bleed-through damage of all types is reduced by 30%, so weaker shields get larger absorption bonuses. For example, if a shield would normally block 50% of Fire damage, buffing it with Magic Shield would allow it to block 65%; if a shield blocks 80% of Fire damage, buffing it will cause it to block 86% of Fire damage. Therefore, bleed-through damage can never be fully negated except in cases where absorption was already at 100% (e.g., physical damage).

Effect lasts for 60 seconds. Duration can be increased via equipping a Lingering Dragoncrest Ring. Switching the weapon equipped in the off-hand away from the shield will remove the effect.